Overview
The ZF 4660.002.029 WG 92 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. As the core drivetrain component in the WG 92 Series, this assembly integrates the main gear cluster, clutch packs, and hydraulic control system into a single, ready-to-install package. The SKU 4660.002.029 is the direct replacement for worn or failed transmissions in loaders, graders, and industrial tractors. It sits between the torque converter and the final drive, managing power distribution across all forward and reverse speeds. For a full rebuild, pair this assembly with a new 4660101017: TRANSMISSION HOUSING to ensure structural integrity, and secure the assembly with a 0631306174: CYLINDRICAL PIN for precise alignment during installation.
Symptoms of Failure
- Delayed or harsh engagement: When the WG 92 assembly wears, you will notice a pronounced lag between shifting and actual gear engagement, often accompanied by a clunking sound. This indicates internal clutch pack wear or hydraulic pressure loss.
- Oil leaks around the bell housing: A common failure mode is seal degradation at the interface between the transmission and the 4660301054: HOUSING II. Look for puddles of ATF under the vehicle after extended operation.
- Gear slipping under load: If the transmission unexpectedly drops out of gear while climbing or pushing, the internal friction discs or piston seals have failed. This is a critical safety hazard.
- Unusual whining or grinding noises: Worn bearings or damaged planetary gears produce a high-pitched whine that increases with engine RPM. Ignoring this can lead to catastrophic failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.002.029 |
| Series | WG 92 |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Housing Material | Cast Iron (GGG-40) |
| OEM Reference | ZF 4660.002.029 |
| Max Input Torque | 1,200 Nm |
| Number of Speeds | 4 Forward / 4 Reverse |
Compatibility
This complete assembly is engineered for the ZF WG 92 transmission family. It is a direct fit for models including the WG180, WG200, and WG92-4 found in articulated dump trucks, wheel loaders, and telehandlers. Always verify the serial number on your existing unit’s 0769123894: TYPE PLATE before ordering. The 4660.002.029 replaces earlier revisions of the WG 92 assembly and is backward-compatible with most post-2005 ZF transmissions.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101017 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4660301054 | HOUSING II | Rear cover housing for clutch pack |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0769123894 | TYPE PLATE | Identification plate with serial number |
| 0750100022 | SCREW PLUG | Seals oil passages and drain ports |
| 4660221029 | SUCTION TUBE | Oil pickup tube from pan to pump |
| 0634100317 | O-RING | Seals suction tube connection |
| 0636103273 | CAP SCREW | Fastens housing sections together |
| 0634306311 | O-RING | Seals cap screw threads |
| 4660321029 | FIXING PLATE | Locks bearing and gear positions |
